General control circuit for active balance

Abstract

A general control circuit for active balance comprises a first sampling wire ( 11 ) and a second sampling wire ( 12 ) by which voltages of adjacent battery packs ( 4 ) are sampled respectively. A first voltage division circuit which is composed of a fourth resistor (R 4 ) and a fifth resistor (R 5 ) connected in series, is connected to the first sampling wire. The voltage division terminal (p) of the first voltage division circuit is connected to one input terminal of a first operational amplifier (U 1 ) and one input terminal of a second operational amplifier (U 2 ) to provide a reference voltage (Vref) for the first operational amplifier and the second operational amplifier. A second voltage division circuit which is composed of a first resistor (R 1 ), a second resistor (R 2 ) and a third resistor (R 3 ) connected in series, is connected to the second sampling wire. The voltage division terminal (m) connected between the first resistor and the second resistor is connected to the other input terminal of the first operational amplifier. The voltage division terminal (n) connected between the second resistor and the third resistor is connected to the other input terminal of the second operational amplifier. The output terminal of the first operational amplifier is connected to an upward energy transfer circuit ( 2 ) of a power balance circuit. The output terminal of the second operational amplifier is connected to a downward energy transfer circuit ( 3 ) of the power balance circuit. The general control circuit is low in cost, easy to be modularized and convenient to be applied.

The invention claimed is: 
     
       1. A general control circuit for active balance, comprises:
 a first sampling wire and a second sampling wire by which voltages of adjacent battery packs are sampled respectively, 
 wherein a first voltage division circuit which is composed of a fourth resistor and a fifth resistor connected in series is connected to said first sampling wire, a voltage division terminal of said first voltage division circuit is connected to one input terminal of a first operational amplifier and one input terminal of a second operational amplifier to provide a reference voltage for said first operational amplifier and said second operational amplifier, a second voltage division circuit which is composed of a first resistor, a second resistor and a third resistor connected in series, is connected to said second sampling wire, a voltage division terminal connected between said first resistor and said second resistor is connected to the other input terminal of said first operational amplifier, a voltage division terminal connected between said second resistor and said third resistor is connected to the other input terminal of said second operational amplifier, an output terminal of said first operational amplifier is connected to an upward energy transfer circuit of a power balance circuit, an output terminal of said second operational amplifier is connected to a downward energy transfer circuit of said power balance circuit. 
 
     
     
       2. The general control circuit according to  claim 1 , wherein when each division voltage of said second voltage division circuit is larger than said reference voltage, said first operational amplifier outputs a high-level signal and said second operational amplifier outputs a low-level signal, when each division voltage of said second division circuit is smaller than said reference voltage, said first operational amplifier outputs a low-level signal and said second operational amplifier outputs a high-level signal. 
     
     
       3. The general control circuit according to  claim 1 , wherein when each division voltage of said second division circuit is equal or nearly equal to said reference voltage, said first operational amplifier outputs a low-level signal and said second operational amplifier outputs a low-level signal. 
     
     
       4. The general control circuit according to  claim 1 , wherein resistance values of said first resistor and said third resistor is much larger than that of said second resistor. 
     
     
       5. The general control circuit according to  claim 1 , wherein voltage division proportion of said first voltage division circuit is larger than that of said voltage division terminal connected between said second resistor and third resistor and smaller than that of said voltage division terminal connected between said first resistor and said second resistor. 
     
     
       6. The general control circuit according to  claims 1 , wherein a voltage follower is provided at said voltage division terminal of said first voltage division circuit.